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True [87]
3 years ago
12

Given matrix A below, calculate det[A] twice using minors and cofactors

Mathematics
1 answer:
Gala2k [10]3 years ago
5 0

Answer:

a. 3(16-21) - 4(8-18) +5(7-12) = -15 + 40 - 25 = 0

b. 3(21-24) - 5(7-12) + 8(4-6) = -9 + 25 - 16 = 0

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Help please. Who ever answers I will follow
lisabon 2012 [21]
This is simple division.
First, look at what you're working with.
You have 2 fractions. Both contain a whole number, and a percentage of a number.

Now, first you can work with whatever is easiest. So, start with the whole numbers. 6/3=2, so for the first part of your answer, the whole number is 2.

Now, move on to the smaller fractions, which are simply just a percentage of a number. you have 1/2, and 2/3. How could you possibly divide this? Well, find a common denominator. 3*2=6, 2*3=6, so 6 is the LCD (Least common denominator, meaning lowest in value common denominator). 

so, what you did to one side you must do to the other. For 1/2, you multiplied the 2 by 3, so you must multiply the 1 by three as well. 1*3=3.
 1/2=3/6 now. 

Do the same for the other part. 3*2=6, so 2*2=4. 
2/3=4/6 now.

Now, you have 6 and 3/6 Divided by 3 and 4/6. Work it out. 

Now, if you calculate it out, you get 2 for the first part. but you can't divide 3/6 by 4/6 without coming up short, so that means you have to factor back in value of 1 out of that 2. So, the 2 becomes a whole number of 1. 

If you care to, convert each fraction into an improper fraction to help.

If you do, your denominator will change to 22, which you can factor back in. You end up getting 39/22.

Which, as a whole, would be 1 and 17/22.

~Hope this helps!
6 0
3 years ago
Ind the value of Z in the following equation: 8Z = 64.
Savatey [412]
The answer to this is 8.

You can solve this by divide 64 into 8. 
64/8=8
z=8
3 0
4 years ago
Read 2 more answers
Mr. Williams asks to buy 12 of a pan of brownies that is 23 full.
pishuonlain [190]

Answer:

10 i think thats not really a questuon tho

5 0
3 years ago
Read 2 more answers
1.Which coordinates are not of the vertices of the feasible region for the system of inequalities?
astraxan [27]
2.   I think the answer is 24

subracting the last 2 inequalities we get

6x + 7y <= 42
3x + 2y  <= 18    subtract:_-
3x + 5y <= 24
3 0
3 years ago
Evaluate if m = –6 and n = –2.<br><br> 2m ÷ n<br><br> –6<br><br> –4<br><br> 4<br><br> 6
Bumek [7]

Answer:

6

Step-by-step explanation:

Put the values of m and n into the equation.

2m ÷ n = 2(-6) ÷ -2

Evaluate.

2(-6) ÷ -2 = -12 ÷ -2

Further evaluate.

-12 ÷ -2 = 6

5 0
3 years ago
Read 2 more answers
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